M-13 (NGC-6205) is a large bright globular cluster in the constellation of Hercules. It was discovered in 1714 by Charles Messier and was added to his catalog as number 13. This is the finest globular cluster in the Northern sky. It lies at a distance of 21,000 light years from Earth, and is 160 light years in diameter. It contains over 500,000 stars.
This image, acquired on September 5, 2021, is a 1 hour integration of 2 minute exposures through the C-11 at f/6.3, using the Starizona SCT III Reducer and the ZWO ASI 2600MC Pro color CMOS camera operating at -15 degrees below ambient temperature and binned 1 X 1. Guided, captured and combined using Maxim DL5 Pro. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Carboni's Astro Tools, and NoiseWare.